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Thread: SVT with sudden rough idle, power loss Reply to Thread
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Topic Review (Newest First)
07-31-2013 10:38 AM
qweesy When did you do the Timing Assembly!? If not dont drive it and get it done ASAP
07-31-2013 10:08 AM
RunninPlaya Thanks swan, i have actually been toying with the idea i have bad gas in her. I live on the Air Force base up here and bases have always had a reputation of shit gas, but the 5 cars before this ran fine on the premium here (to include my 02 ws6 trans am). I'll have to run some seafoam through her and get enough gas in it to run downtown and fill it up.

Oh and i finally got my CEL i was waiting for, replaced my front O2 and the rear is bad now.... FML

--Brett
07-31-2013 09:11 AM
swansong
Quote:
Originally Posted by RunninPlaya View Post
ok so what ended up being the issue, not to sound too much like a dick. sunday half a mile from the house my starts running like yours did OP and it will continually run, just like it's bout dead tho.
--Brett
My issue ended up being...

[drumroll]

Bad gas. For real. Here's a post I made in another thread, I had intended to update this one with the resolution to the problem, but I guess I got excited that it was actually fixed and forgot about it.

Quote:
Originally Posted by swansong
Seems like my problem is fixed or at least improving as well. Blackstealth03 came over Saturday and we swapped coils. That didnt do anything, but we were able get the car running with the gas on intake thing. Once it was warm it ran ok, but felt down on power, like 50%. Figuring it might just be as simple as bad gas, I put some Heet and Seafoam in the tank and tried to drive it off. Put 100 miles on and it ran better as it went, almost completely back to normal. Still has a small hiccup between 1500 and 2500 rpms, usually in second gear. Filled it up with gas again and let it sit overnight in the cold. It fired right up this morning. So I'm hoping it was just shit gas (Citgo FWIW), but I wouldn't be surprised if it still acts up in the next few days. Gonna try driving it to work again though!
Haven't had any issues since that day. I can't say whether or not the fuel filter and pump really needed to be replaced, but they were both either very old or original, so I'm glad I replaced them anyway.
07-31-2013 08:31 AM
RunninPlaya Just an update on my issues if it helps anyone to help me figure this out. Drove the car today with it wanting to fall on it's face, as the car warmed up it started to smooth out. But what it is doing is stumbling and has a HUGE loss of power up to 2000-2250 roms, once i hit that it wants to almost run away like a diesel motor, but will settle. It did get better as it warmed up, just gonna limp it today to hopefully get a check engine light.
07-30-2013 11:38 PM
RunninPlaya ok so what ended up being the issue, not to sound too much like a dick. sunday half a mile from the house my starts running like yours did OP and it will continually run, just like it's bout dead tho. i didn't get to check my CEL because i'm used to having a CEL for my primary O2, unhooked the battery for 5 minutes and it had reset but i've had codes stay on for up to 2 hours with battery unhooked before. i'm stumped, and i'm trying to avoid back yard rigging this car to make it run right.

btw, 100% stock 03 5-door

--Brett
02-02-2013 11:03 PM
esmith2039
Quote:
Originally Posted by swansong View Post
I thought about that, but temp sensor reports good readings, both on the dash gauge and in my SCT logs.
So did my dash gauge for about six months. Took that long to figure it out.
02-02-2013 10:41 PM
swansong
Quote:
Originally Posted by esmith2039 View Post
Have you replaced the coolant temp sensor?
I thought about that, but temp sensor reports good readings, both on the dash gauge and in my SCT logs.

Quote:
Originally Posted by TheCarGuy4All View Post
Is the VCT working properly?
Ought to be. No codes about it being wrong, and it acted normal up to 6k rpm on one of the test drives where it was running ok.

Quote:
Originally Posted by BC_ZX3 View Post
x2. I would suggest after reading your tthread and all your symptoms, you check the coil and coil connector thoroughly.

Can you beg or borrow a substitute coil to try also?
The wiring and coil look ok, but looks can be deceiving. I can borrow a coil, and had in fact arranged to do so before I got it running again and thought I fixed the problem. I think the coil being bad is a more likely scenario than VCT or ECU, but I didn't really realize it could allow my car to be semi-functional like it is. I'll check it out more thoroughly.
02-02-2013 09:58 PM
BC_ZX3
Quote:
Originally Posted by swansong View Post
Yeah I really think its a silly electrical issue somewhere.
x2. I would suggest after reading your tthread and all your symptoms, you check the coil and coil connector thoroughly.

I had intermittent good/crappy running conditions such as yours and it turned out to be the coil connector. What I believe was happening was that, once warm, condensation or moisture evaporated or simple minor expansion of wires under heat restored the continuity of the wires enough to make the car run normally (still somewhat intermittent under load); during cool off, it was back to hard starting and poor runninng and the cycle would repeat.

Can you beg or borrow a substitute coil to try also? The intermittent may be inside the coil as well as being related to the connector. I'd aslo unwrap the black plastic coil connector harness sheathing back a good six or eight inches to trace the wiring and make sure all is well.
02-02-2013 09:42 PM
TheCarGuy4All I dont' know. Something about it is bothering me. If you can get spark and fuel to all four cylinders so it will crank over and fire with ether or whatever, and it'll run up to operating temperature. So you've got fuel, spark, enough timing to keep both somewhat in line, but cold and hot you've got a problem.
So, it has to be oil, fuel, or electrical. A sensor would have to be very odd to have faults at two points within the range (as I'm sure you know), but mechanically, you might have variances.
Is the VCT working properly? The reason I ask is that there was a TSB on it way back when. If the oil pressure is varying and it is slipping the cam lobe off the tappit, or isn't aligned well enough to open and close properly, it could be a problem. Also, oil chambers in Ford's of this vintage can have really finicky oil passages, so you could have a clog. But that seems unlikely given the mid temp ability, but not the high temp.
Definitely confusing as all hell.
Let me know your progress and I will continue to think on it.
As for my own predicament, there was also an old TSB that dealt with stuff I thought was just the character of the car. I'm going to try a reflash and hope it works.
02-02-2013 09:31 PM
esmith2039 Have you replaced the coolant temp sensor? Not sure on exact name but its the sensor on the thermostat housing. The SPI is a different animal but had a odd problem with it. At cold it wouldn't start tried everything. Eventually it would but wasnt happy till warmed up. Finally one day the gauge literally went from one side to the other a few times or never would of found it. Good luck..
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